Abstrakt

Heat Transfer Enhancement for Double Pipe Heat Exchanger Using Twisted Wire Brush Inserts

Deepali Gaikwad , Kundlik Mali

Thermal Performance of heat transfer devices can be improved by heat transfer enhancement techniques. In the present study, heat transfer from hot water to cold water by double pipe heat exchanger for plain tube and plain tube with twisted wire brush inserts is experimentally investigated. The horizontal double pipe heat exchanger is made from straight copper tube with inner tube and outer tube diameters of 15 and 25 mm, respectively. The twisted wire brush inserts are fabricated by winding a 0.2 mm diameter of the copper wires over a 2 mm diameter two twisted iron core-rods. The inner convective heat transfer coefficient, friction factor are determined as a function of tube geometry and hot air Reynolds number. Effect of inlet fluid temperature and other relevant parameters on heat transfer characteristics and pressure drop are studied for laminar flow. The convective heat transfer coefficient of double pipe heat exchanger under various operating conditions was determined.